Experimental Study on Backfilling Mine Goafs with Chemical Waste Phosphogypsum

Table 2

Linear relationship curve () of PGBS.

PGBS concentration (%)	Regression equation ()	Slope ()	Square relation
62		0.32	0.924
64		0.32	0.876
65		0.30	0.752
66		0.39	0.723
67		0.39	0.747
68		0.64	0.960